Hoist



July 8, 1958v J. T. WlTCHER HOIST Filed March 19, 1957 Fig. 2

INVENTOR James 7. Mfcher United States Patent I-IOIST James T. Witcher, Roswell, N. Mex. Application March 19, 1957, Serial No. 647,024

2 Claims. (Cl. 212-35) This invention relates to lifting hoists.

It is an object of the present invention to provide a lift ing hoist which is light in weight and is particularly designed to be used on loading platforms or the back ends of delivery trucks and the like, and which is operated by a hydraulic jack.

It is another object of the present invention to provide a lifting hoist of the above type which may be swiveled about a vertical axis.

Other objects of the invention are to provide a lifting hoist bearing the above objects in mind which is of simple construction, has a minimum number of parts, is inexpensive to manufacture and efiicient in operation and in use.

For other objects and for a better understanding of the invention, reference may be had to the following detailed description taken in connection with the accompanying drawing, in which:

Figure 1 is a perspective view of a preferred embodiment of the present invention shown partly in section;

Fig. 2 is a vertical sectional view thereof taken along the line 22 of Fig. 1; and I Fig. 3 is a fragmentary vertical sectional view taken along the line 3-3 of Fig. 2.

Referring now more in detail to the drawing, represents a rectangular mounting plate having the mounting openings 11 for bolting the device down onto the supporting surface, substantially as illustrated.

A hollow cylindrical member 12 is welded at its lower end to the mounting plate 10, and this mounting is reinforced by the angularly spaced braces 13, the braces 13 being welded to the plate '10 and to the bearing member 12.

A standard or supporting pipe 14 is rotatably positioned within the bearing member 12 extending upwardly above the upper end thereof and fixedly mounting at its upper end the supporting plate 15 which is welded thereto. Braces 16 reinforce the connection between the plate 15 and the pipe 14, being welded thereto.

A pair of angle bars 17 are welded to the undersurface of the plate 15 along the opposite longitudinal edges thereof, Fig. 3.

A pair of laterally spaced uprights or upstanding plates 18 are welded at their lower ends to the angle bars 17 and to the plate 15, a transverse brace 19 being welded across the rear edges of the uprights 18 near the top and connecting the same.

Braces 20 reinforce the mounting of the uprights 18 on the plate 15, being welded thereto.

An elongated boom or pipe 21 is rotatably mounted at one end intermediate the upper ends of the uprights 18 by means of the anchor pin 22, the other end of the boom having an elongated slot 23 and at the bottom thereof which receives therethrough downwardly the lift chain 24 to the end of which is secured a lift hook 25.

A hydraulic jack indicated generally at 26 is provided and includes the base plate 27 to which is secured the jack pad 28 by means of the nut and bolt assembly 29 (Fig. 2). The hydraulic jack 26 is of conventional construction and includes the usual handle 30 which raises the member 31, as will be obvious.

A hearing member or transverse pipe 32 is welded of which are received within a pair of laterally aligned I openings provided in the forward ends of the angle irons A block 34 is welded to the bottom of the boom 21 above the jack 26, having a semicylindrical recess 35 which receives the bottom of the pipe therewithin. A pair of laterally spaced lugs 36 are welded to the bottom of the block 34 and are provided with laterally aligned openings which receive therethrough the anchor pin 37 which passes through the eye provided in the upper end of the lifting member 31.

In operation, the boom will be raised by cranking the jack 26 by means of the handle 30, the boom pivoting about the anchor pin 22 to lift the objects by means of the lift chain 24 and the hook 25 thereof. When the boom 21 is in the extreme upper and lower positions, the jack will pivot about the pin 33. By means of the hearing member 12 the hoist may be swiveled.

While various changes may be made in the detail construction, it shall be understood that such changes shall be within the spirit and scope of the present invention as defined by the appended claims.

What I claim as new and desire to protect by Letters Patent of the United States is:

1. A hoist comprising, in combination, a base plate, a pair of laterally spaced apart uprights secured to one end of said base plate, an elongated boom, one end of said boom being pivotally mounted intermediate the ends of said uprights, lift chain means at the other end of said boom, a hydraulic jack having a pad, means pivotally mounting the lower end of said jack on the other end'of said base plate, means pivotally connecting the upper end of the jack to said boom, and means for rotatably mounting said base plate, said means pivotally mounting the lower end of said jack on said base plate comprising a pair of angle irons secured to the under surface of said base plate along the opposite longitudinal edges thereof, said angle irons having a pair of laterally aligned openings, a rocker pin having the opposite ends positioned within said angle iron openings and passing across said base plate, said jack pad being bolted to the bottom of said jack, and a hollow cylindrical bearing member secured to the bottom of said jack pad and rotatably receiving said rocker pin therethrough, said means rotatably mounting said base plate comprising a depending cylindrical member secured to the under surface of said base plate, a mounting plate having mounting openings and a hollow cylindrical bearing member secured at the lower end to said mounting plate and rotatably receiving therewithin said cylindrical member and a plurality of angularly spaced braces connecting said bearing member with said mounting plate, said boom including a substantially hollow cylindrical member, said lift chain means comprising an elongated slot adjacent to one end of said hollow cylindrical boom member, and a lift chain passing upwardly through said slot and out of the open end of said boom and terminating in a lift hook.

2. A hoist according to claim 1, including first brace means reinforcing the connection of said base plate with said cylindrical member, second brace means reinforcing the connection of said uprights with said base plate, and a transverse brace connecting said uprights near the upper ends thereof.

References Cited in the file of this patent UNITED STATES PATENTS 2,109,304 Ormsby Feb. 22, 1938 2,445,160 Torgersen July 13, 1948 2,517,813 Wallace Aug. 8, 1950 

